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Báo cáo sinh học: " Likelihood and Bayesian analyses reveal major genes affecting body composition, carcass, meat quality and the number of false teats in a Chinese European pig line"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Likelihood and Bayesian analyses reveal major genes affecting body composition, carcass, meat quality and the number of false teats in a Chinese European pig line | 385 Genet Sei. Evol. 35 2003 385-402 INRA EDP Sciences 2003 DOI 10.1051 gse 2003030 Original article Likelihood and BaYesian analyses reveal major genes affecting body composition carcass meat quality and the number of false teats in a Chinese European pig line Marie-Pierre Sancheza Jean-Pierre Bidanela Siqing Zhanga Jean Naveaub Thierry Burlotb Pascale Le Roya a Institut national de la recherche agronomique Station de génétique quantitative et appliquée 78352 Jouy-en-Josas Cedex France b PEN AR LAN BP 3 35380 Maxent France Received 3 June 2002 accepted 26 December 2002 Abstract - Segregation analyses were performed using both maximum likelihood - via a Quasi Newton algorithm - ML-QN and Bayesian - via Gibbs sampling - Bayesian-GS approaches in the Chinese European Tiameslan pig line. Major genes were searched for average ultrasonic backfat thickness ABT carcass fat X2 and X4 and lean X5 depths days from 20 to 100 kg D20100 Napole technological yield NTY number of false FTN and good GTN teats as well as total teat number TTN . The discrete nature of FTN was additionally considered using a threshold model under ML methodology. The results obtained with both methods consistently suggested the presence of major genes affecting ABT X2 NTY GTN and FTN. Major genes were also suggested for X4 and X5 using ML-QN but not the Bayesian-GS approach. The major gene affecting FTN was confirmed using the threshold model. Genetic correlations as well as gene effect and genotype frequency estimates suggested the presence of four different major genes. The first gene would affect fatness traits ABT X2 and X4 the second one a leanness trait X5 the third one NTY and the last one GTN and FTN. Genotype frequencies of breeding animals and their evolution over time were consistent with the selection performed in the Tiameslan line. segregation analysis likelihood Bayesian major gene pig Correspondence and reprints E-mail sanchez@dga2.jouy.inra.fr 386 M.-P. Sanchez et al. 1. introduction .